Ezquerra and was published by Dark Horse Comics. The Japanese version has collaboration events related to the tank-battle anime series Girls und Panzer; by 2021 these events were extended to the other languages and servers. As of June 2017, Wargaming released two premium tanks based on the anime series Valkyria Chronicles on the East Asia server. Six voice packs featuring the characters from the anime and an expansion pack changing the tanks' look have also been released. In August 2017, Wargaming and World of Tanks announced a collaboration with the Swedish metal band Sabaton, shooting a World of Tanks drive-style video for Sabaton's song "Primo Victoria", and adding a tank named "Primo Victoria" to the game. This featured the Sabaton logo, with its crew having the visual likenesses of Sabaton members, and lead singer Joakim Brodén voicing the captain of the tank. In July 2020, the console version partnered with the WWE to produce in-game content, such as vehicles, related to various WWE wrestlers, such as Becky Lynch, Stone Cold Steve Austin, Sgt. Slaughter, and others. Later that year, this version also partnered with Mattel, makers of the Hot Wheels brand to create various Hot Wheels-themed content. World of Tanks console and PC both collaborated with the makers of G.I. Joe to release in-game cosmetics that would make certain tanks resemble GI Joe vehicles, and exclusively on console, a playable version of two armored fighting vehicles from the G.I. Joe: A Real American Hero series, the M.O.B.A.T. and the H.I.S.S. World of Tanks Blitz In May 2013, Wargaming announced World of Tanks Blitz, a mobile version of World of Tanks for tablets and smartphones using Windows 10, Android and iOS. The game allows 7v7 battles, as compared to the 15v15 battles on PC. The Closed Beta Test (CBT) started on 19 March and ended 3 April. World of Tanks Blitz was released (on iOS only) in May 2014 in European countries like Norway, Sweden, Finland, Denmark, and Iceland, with all other countries, at the time, awaiting launch. It was released on 27 June 2014 in North America (again, on iOS only). Beta testing of the Android version was released in Russia, with World of Tanks Blitz being released worldwide later on 4 December 2014. The game was released in the Windows Store on 28 December 2015, making it available for PC users running Windows 10. On 9 November 2016, World